Which two properties are of less importance in determining RADAR cross-section (RCS)?

When assessing the RADAR cross-section (RCS) of an object, the properties that play a significant role are typically the object's shape and material. These characteristics directly impact how radar waves interact with the object, influencing factors such as reflection and absorption.

However, size and aspect (the orientation of the object relative to the radar source) are considered less important in certain scenarios. While the size of an object can affect its RCS, smaller dimensions might not contribute significantly to the RCS if the object’s shape and materials are optimized for stealth. Additionally, the aspect can change based on the position of the radar and the target, meaning it's not always a consistent factor in calculating RCS.

In contrast, the intersection of shape and material tends to have a more fixed and predictable impact on how radar waves are scattered or absorbed. Therefore, when determining which two properties are of lesser importance, the combination of size and aspect is a fitting choice, as these are more variable and less definitive compared to shape and material.